I checked the connection and found the plug to be slightly corroded. So, I cleaned the plug and the post on the sensor and squished the plug so it fit  nice and tight on the post. Started it up and the gauge started moving. Unfortunately it got as far as the first white mark and then dropped all the way back down. 

I�m thinking a new sensor.  Thoughts?  

> On Sep 5, 2015, at 9:57 PM, David Beierl <dbeierl@attglobal.net> wrote:
> 
> At 08:03 PM 9/5/2015, Kk Al wrote:
>> Thanks for your time and info.�  We are traveling , so I'll check the wire � before we start out again tomorrow. The gauge came to life a couple times for about two minutes then dropped back down.
> 
> Your low-coolant warning will still operate with the temp sender disconnected, but of course the overheat warning won't.
> 
> 
>> The cooling fan and everything else seems to be working as it should.�
>> 
>> We've replaced the coolant pressure bottle and sensor with an upgraded aluminum unit from Van Cafe. I'll double check that as well
> 
> Smart.  I just had a bottle start to weep right where the hard spot is at the beltline, where the minimum level mark is built up.  It also has a crack that's visibly open on the outside but not yet leaking, on the shoulder between filler and sender.  This is a tank apparently made from OEM molds (i.e. showing where some numbers were erased from the mold) that is less than five years old, possibly only three.  I'm impressed, but not favorably.  As far as I know the one it replaced was original, twenty-plus and showing beltline crackage but not leaking, and no shoulder cracks.  The one on my '84 was still ok at twenty years.
> 
> Yours,
> David
>